The KoverRoos® Deep Seating Sofa Cover is the ultimate in furniture protection. The material, design, and construction are simply the best on the market. Outdoor furniture covers need to breathe so that moisture can escape, keeping mold and mildew from developing under the cover. KoverRoos® Deep Seating Sofa Cover use technologically advanced materials that are one-way breathable - so moisture can evaporate right through the fabric, but water, dust and dirt can't get in. KoverRoos® Deep Seating Sofa Cover covers are stronger than most vinyl covers, yet light weight. This means our covers are easy to use - no struggling to get them on and off. Also, these patio furniture covers are able to handle temperatures from -100 degrees Fahrenheit up to +240 degrees. The Weathermax™ Deep 2-Seat Sofa Cover is appropriate for most weather conditions. This particular cover comes with a u shaped hook/bungee system (set of 4) attachment system in order to secure the cover in harsher weather conditions.